Mortising-pool.



No. 652,945. Patented July 3, I900. H. WlT-HERWAX.

'MORTISING TOOL.

(Application Med Apr. 10, 1900.)

(No Model.)

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HENRY W ITHERIVAX, OF GUILDERLAND, NEW YORK.

IVIORTISING-TOOL.

SPECIFICATION forming part of Letters Patent No. 652,945, dated July 3,1900.

Application filed April 10, 1900' To all whom, it may concern.-

Be it known that I, HENRY WITHERWAX, a citizen of the United States,residing at the town of Guilderland, in the county of Albany and Stateof New York, have invented'certain new and useful Improvementsin'Mortising- Tools; and I do hereby declare the following to be a full,clear, and exact description of the invention, such as will enableothers skilled in the art to which it appertains to make and use thesame. U

My invention relates to mortising tools adapted to be used in mortisingthe framework of buildings, and has for its object to provide means -forquickly and accurately forming the heads of a mortise. This I accomplishby the means illustrated in the accompanying drawings, in which Figure 1is a side elevation of a device embodying my invention. Fig. 2 is a planview of the same. Fig. 3 is a vertical longitudinal section taken online X X of Fig. 2. Fig. 4c is a side elevation of a mdrtising-chisel.

As illustrated inv the drawings, A represents a base supporting ahead-block B, which is provided with a vertical slot b, extendingthrough the head B and the base A, as shown in Fig. 3. The head B isalso provided with a recess 5 adapted to contain the forward end of alever D, and is cut away to conform to the sweep of said lever. Thislever is fulcrumed on a transverse pin 19 secured to the head-block Band passing through the slot d, formed in the lever D. A chisel E,having a beveled edge e and preferably provided withv transverseapertures e, is arranged vertically in the slot 5. The upper end of thechisel E is provided with a head F and with a transverse pin G.

Pivoted gage-blocks H may, if desired, be secured to the base A, and oneend of said blocks may be reduced so that when said blocks are arrangedin a vertical line and placed against the side of the beam the chisel Emay be adjusted at the desired distance from the edge of the beam to bemortised. The side of the head-block Bis provided with gage-marks b, asshown in Fig. 1, which indicate the vertical walls of the slot 19, andconsequently the line traveled by the edge of the chisel E; The beam tobe mortised is first marked on its side with vertical lines Serial No.12,344. (No model.)

indicating the location of the headsof the mortise to be formed throughthe top of said beam. This device is then placed upon the top of thebeam so that the gage-marks b shall coincide with the vertical linesdrawn on the side of the beam. The gage-blocks H may then be arrangedvertically, so that the lower portion of said blocks willbear againstthe side of the beam, and the chisel E will then be located at the lineindicating the head of the mortise. When the reduced end of thegage-block H is placed against the side of said beam or timber, thechisel E is set at a greater distance from the edge of the beam than ifthe full end of the gage-block H be used. When the tool has been soplaced that the chisel E is at the line desired to form the head of themortise, the chisel is then driven into the beam by means of a sledgeuntil the chisel is forced through the beam, removing the portions ofthe timber left by the auger and leaving a clean and smooth wall for thehead of the mortise. The tool is then reversed and the fiat side of thechisel E is brought in coincidence with the line indicating on the sideof the timber the other head of the mortise, and the chisel is againforced through the timber the same as before. The irregular portions ofthe sides of the mortise which have been left by the auger may then bereadily removed. When the chisel E is driven into the beam, it willnaturally wedge there, and the lever D is then moved inward on the pivot19 by means of the slot d until the forward end d of the lever D entersone of the transverse slots 6', formed in the chisel E. Asufficientpressure is then brought to bear upon the outer end of the lever D toforce said chisel upward. The stop G prevents the chisel E from beingforced so far downward that the forward end of the lever D cannot enterthe top opening 6 of the chisel.

I do not desire to be limited to a chisel having the transverse openingse. Any other construction which will enable the forward end d of thelever D to obtain a sufficient hold on the chisel E to raise it whendesired may be used Without departing'from my in vention.

What I claim is- 1. In a mortising-tool,the combination with a headhaving a vertical slot, of a chisel mov- 3. In a mortising-tool,thecombination with a head having a vertical slot, of a chisel extendingabove said head and movable in said slot, and a lever having a pivotaland limited longitudinal movement, and adapted to engage with the sideof said chisel and raise the same, substantially as shown and described.

In testimony whereof I affix my signature in presence of two witnesses.

HENRY VVITHERWAX.

\Vitnesses:

ROBERT W. HARDIE, GEORGE B. YOUNG.

